In the documentation for Data.Sequence.index:
index :: Seq a -> Int -> a
O(log(min(i,n-i))). The element at the specified position, which
should be a positive integer less than the size of the sequence. If
the position is out of range, index fails with an error.
==
'a positive integer' refers to an number in the set of {1, 2, 3, …}
but through some code discovered that what it really means is a non-
negative integer, {0, 1, 2, …} Although it would be more immediately
known if it just said it was a 0 based index.
- iæfai
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